Much like last year's edition which added the Archenemy format, M:TG Duels of the Planeswalkers 2013 will also be adding a wild new multiplayer format: Planechase. Based off of this summer's upcoming Planechase expansion, this new multiplayer format is just like a standard game of Magic, except that players, once a round, flip over a large Planechase card which represents a new battleground. These Planechase cards have different effects on the game, such as doubling the number of tokens in play, letting everyone draw a card, all damage is doubled, etc.

Here's an example from the original Planechase expansion for the physical card game:

We can only hope that this summer, we'll be doing battle with Goat tokens.